Using the point H_c and the point N, construct a circle k(N,M_a) (rule W06);

% NDG: points H_c and N are not the same

Choose freely a point H_a on the circle k(N,M_a) (rule WOncircle)

Using the point H_a and the point H_c, construct a line m(H_aH_c) (rule W14);

% DET: points H_a and H_c are not the same

Using the circle k(N,M_a) and the line m(H_aH_c), construct a point M_b and a point E_b (rule W04);

% NDG: line m(H_aH_c) and circle k(N,M_a) intersect

Choose freely a point A on the circle k(M_b,C) (rule WOncircle)

Using the point A and the point M_b, construct a point C (rule W01);

Using the point A and the point H_a, construct a line h_a (rule W02);

% DET: points A and H_a are not the same

Using the point H_c and the point C, construct a line h_c (rule W02);

% DET: points H_c and C are not the same

Using the line h_a and the line h_c, construct a point H (rule W03);

% NDG: lines h_a and h_c are not parallel

% DET: lines h_a and h_c are not the same

Using the point N and the point H, construct a point G (rule W01);

Using the point M_b and the point G, construct a point B (rule W01);